I've built and done some simple tests on a TEVO Tarantula but I've noticed some pretty dramatic under extrusions.
- TEVO Tarantula;
- Jim Brown's easy config fork of Marlin;
- Titan extruder (came with printer).
I've updated the firmware with the 400 steps as advised and calibrated the extrusion with the 100 mm method:
- When I run the calibration with the Titan extruder, only the 400 steps is fine and works as expected;
- When I connect the Bowden tube to the hotend and calibrate (at 200, 225 and 250°C), I see only ~50 mm of extrusion.
I've disassemble the hot end, changed filament and I can't see any signs of blockage. The Bowden tube in the hotend is not showing any signs of melting etc. and it is pushed all the way down to the hotend, as per the instructions.
So, what's going with this?